WATCH: The real reason behind why Christian Bale is gaining weight

Christian Bale has undergone some dramatic physical transformations for his parts in films such as The Machinist and The Dark Knight Trilogy and once again the actor is ready to undertake the challenge.

Bale, 43, is bulking up to play former US Vice President Dick Cheney in his upcoming biopic.

In an interview to Variety at the ongoing Toronto international film festival, Bale opened up about his next transformation as the lead of the upcoming Dick Cheney biopic.

The actor said in order to develop the proper body type and gain weight, "I've just been eating a lot of pies." Adam McKay is set to direct the film, which will also star Steve Carell as Secretary of Defense Donald Rumsfeld and Amy Adams as Lynne Cheney.

Christian Bale has been eating "lots of pies" for his next film | #VarietyStudio presented by @ATT #TIFF17 https://t.co/koFxWobn6q pic.twitter.com/olXHjmx2gl

— Variety (@Variety) September 13, 2017

The film is currently untitled and has not yet begun filming.